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SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (supplemental cash flow information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash and cash equivalents $ 71,962 $ 40,435 $ 41,231  
Restricted cash and restricted cash equivalents included in funds held for customers $ 383,134 $ 294,165 $ 241,488  
Restricted cash and restricted cash equivalents included in funds held for customers [Extensible Enumeration] Funds held for customers, including securities carried at fair value of $8,126 as of December 31, 2022 Funds held for customers, including securities carried at fair value of $8,126 as of December 31, 2022 Funds held for customers, including securities carried at fair value of $8,126 as of December 31, 2022  
Non-current restricted cash included in other non-current assets $ 2,937 $ 2,815 $ 2,772  
Non-current restricted cash included in other non-current assets [Extensible Enumeration] Other non-current assets Other non-current assets Other non-current assets  
Cash, cash equivalents, restricted cash and restricted cash equivalents $ 458,033 $ 337,415 $ 285,491 $ 229,409
Interest paid 115,556 87,108 46,621  
Income taxes paid 47,945 38,629 18,761  
Accrued purchases of capital assets 11,924 1,340 6,477  
Non-cash consideration for customer list purchases [1] 0 5,096 15,528  
Restricted stock units [Member]        
Vesting of restricted stock unit awards $ 8,538 $ 13,602 $ 16,646  
[1] Consists of pre-acquisition amounts owed to us by the sellers.